Won't crank won't start

I have a 1999 buick lesabre limited. Won't crank won't start. Car does not crank over when I turn key to start position dash lights cut out for about 3 sec. Then come back on. Battery connections seem fine. Security light is only on when doors are open an not at all when key is in start position. Car use to run great then after shut off just wouldn't start. Then would start sometime later. Now won't crank or start at all. Also arced starter cranked wouldn't start. While doing that checked for spark from wires. There was no spark. Any ideals? All ideals are welcome please comment. I am stumped

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